Cylinder lock



Oct. 26 19376 E. N JACOB] CYLINDER LOCK 2 Sheets sheet l Filed June 5, 1956 @et 26, 1937. E. N. JAcoBl 2,097,19

CYLINDER LOCK Filed June 5, 1936 2 Sheets-Sheet 2 Patented Oct. 26, 1937 UNITED STATES CYLINDER LOCK Edward N. Jacobi, Milwaukee, Wis., assignor to Briggs & Stratton Corporation, Milwaukee, Wis., a corporation of Delaware Application June 5, 1936, Serial No. 83,676

8 Claims.

This invention relates to locks and refers particularly to removable cylinder locks.

It is an object of this invention toprovide improved means for removably securing a cylinder in its casing.

Another object of this invention is to provide a lock in which the cylinder is vpositively held against withdrawal except in one position of rotation and to which position the cylinder is normally prevented from being moved by releasable stop means.

A further object of this invention is to provide releasable stop means for defining one of the normal limits of rotation of the cylinder which is held in place by the usual finishing cap covering the head of the cylinder.

Another object of this invention resides in the provision of means whereby the releasable stop is also utilized for determining the location of the cylinder during its insertion and removal so as to facilitate the assembly of the parts.

Another object of this invention is to provide a releasable stop for determining one of the normal limits o-f rotation of the cylinder which is releasable by means of a tool insertable into the front of the keyway.

With the above and other objects in View which will appear as the description proceeds, this invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly dened by the appended claims, it being understood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the claims.

The accompanying drawings illustrate one complete example of the physical embodiment of the invention constructed according to the best mode so far devised for the practical application of the principles thereof, and in which:

Figure 1 is a longitudinal sectional view through a lock embodying this invention with parts thereof broken away;

Figure 2 is a front view of the lock sho-wing the key in section and the finishing cap removed;

Figure 3 is a cross sectional View through Figure 1 on the plane of the line 3 3;

Figure 4 is a view similar to Figure 3, but showing the cylinder in its unlocked position of rota- 50 tion;

Figure 5 is a view similar to Figure 4, but showthe cylinder turned to its withdrawing position;

Figure 6 is a cross sectional view through Fgure 1 on the plane of the line 6 6;

(Cl. 'Y0-368) Figure 7 is a perspective view of the lock casing; Figure 8 is a perspective View showing themanner in which the cylinder is freed for rotation past one of its normal limits of rotation for movement to its position of withdrawal; 5

Figure 9 is a detail sectional view taken through Figure 3 on the plane o-f the line 9 9; and

Figure l0 is a perspective view of the releasable stop per se. f

Referring now particularly to the accompanying drawings in which like numerals indicate like parts throughout the several views, the numeral 5 designates a casing which is bored as at 6 for the reception of a lock cylinder 1. The lock illustrated is of the side bar type wherein a locking bar 8 is projectible from the side of the cylinder by the key operable tumblers (not shown) but it is to be understood that the inventio-n is not restricted to this one type of lock` When the cylinder is in its locked position of '20 rotation, the bar 8 projects into the longitudinal groove 9 in the casing Wall, and upon retraction of the tumblers (not shown) by the insertion of a proper key Ill into the keyway II of the cylinder, all of the tumblers are moved to positions T25 at which they permit the locking bar 8 to be retracted out of the groove 9 thus freeing the cylinder for rotation.

'I'he rotation of the cylinder is normally restricted to within predetermined limits and as "30 long as the cylinder is not turned past these limits, securing means at the inner end of the cylinder is effective to prevent withdrawal of the cylinder from the bore. The securing means for holding the cylinder in the bore comprises two t35 diagonally opposite lugs I2 and I3 of different widths projecting inwardly from the bore of the casing for engagement in an annular groove i4 formed in the inner end of the cylinder. K To permit engagement and disengagement of the lugs "40 with this annular groove, the rear wall I5 of the groove has two gateways or openings I6 and I'I corresponding in size to the lugs I2 and I3, respectively, and through which the lugs may be passed.

As long as the cylinder is not turned beyond either one of its normal limits of rotation, these gateways I6 and I'l are not aligned with the lugs I2 and I3, but upon rotation of the cylinder past one of its normal limits of rotation, such alignment may be effected and the cylinder freed for withdrawal.

The normal limits of rotation of the cylinder are defined by a radial lug I8 projecting from the side of the cylinder directlyV under its head I9 which engages the front end of the casing and a releasable stop member 20 also projected from the cylindrical surface of the cylinder. The lug I8 and the releasable stop member 20 are in transverse alignment and are respectively received in arcuate grooves 2I and 22 opening to the mouth of the bore 6.

'Through engagement of the lug I8 with one end 23 of the groove 2l, the locked position of rotation of the cylinder is defined. The unlocked position of rotation is defined by the engagement of the releasable stop member 2D with the end 24 of the groove 22.

The releasable stop member, as best shown in Figure 10` comprises a substantially L-shape-d bar having a main stem 25 and a head 26. The main stem 25 is slidable in an elongated recess 21 opening to the front face of the cylinder head I9, and the head 26 of the stop member is disposed in a deeper recess 28 located at one end of the recess 21 and opening to the back of the cylinder head I9 so as to permit the head 26 to project beyond the cylindrical surface of the cylinder, as shown.

Conned between the end of the stem 25 opposite that at which its head 26 is located, and the adjacent end of the recess 21 is an expansive spring 29 which yieldingly urges the releasable stop member in a direction to project its head 26 from the cylindrical surface of the cylinder, or in other words, into operative position. To coact with the walls of the recess 21 in retaining the spring properly located, a projection 30 is formed on the adjacent end of the stem 25.

The stop member together with its spring are properly held assembled with the cylinder by a nishing cap 3l which is secured over the head of the cylinder, as is customary.

Attention is directed to the fact that one side of the stem 25 is beveled off as at 32 to facilitate the guiding of the key into the keyway. By reason of this bevel 32 and the slight overhang of the projection 30 from the front and adjacent side edge of the stem 25, an abrupt shoulder 33 is provided. This shoulder, it will be observed, lies directly adjacent the side of the key when the same is in position so that it is readily accessible to a releasing tool such as a wire 34 (see Figure 8) which may be inserted into the keyway alongside of the key to lift or slide the releasable locking member in a plane parallel to the side of the key so as to retract its locking head 26 out of engagement with the end 24 of the groove 22 when' the cylinder is in its unlocked position of rotation. Upon such retraction of the locking member, the cylinder is free to be turned past its normal limit of rotation defined by the releasable stop member, to a position permitting the withdrawal of the cylinder.

When the cylinder is so located as shown in Figure 5, the gateways I6 and I1 are in line with the lugs I2 and I3 and the cylinder is free for withdrawal. Also in this position of rotation, the releasable stop member or rather its head 26 is in line with a notch 35 formed in the front end of the casing and spaced from the groove 22 a slight distance by a partition 36.

The notch 35 has an inclined bottom 31 (see Figure 9) so that in assembly it is only necessary to insert the cylinder into the casing bore and align the head 26 of the releasable stop member with the notch 35 and apply an inward pressure whereupon the releasable stop member is forced inwardly against its spring 29 to allow complete assembly of the parts.

In this manner the determination of the proper position of assembly, that is, the position of rotation of the cylinder at which the bayonet slot at its inner end may be engaged is materially facilitated.

From the foregoing description taken in connection with the accompanying drawings, it will be readily apparent to those skilled in the art to which this invention appertains, that this invention provides a novel and lsimple manner of removably securing a lock cylinder in its casing.

What I claim as my invention is:

1. In a lock, a bored casing, a lock cylinder rotatable therein between predetermined normal limits of rotation upon the insertion of a proper key into the keyway of the cylinder, means for positively preventing withdrawal of the cylinder from the casing bore except in a predetermined position of rotation which lies beyond one of its normal limits of rotation, a releasable stop member movably mounted on the cylinder and yieldingly urged into engagement with the casing to define said normal limit of rotation, and means on said releasable stop member engageable by a tool inserted lonigtudinally into the mouth of the keyway by which said releasable stop member may be retracted to free the cylinder for rotation past said limit.

2. In a lock, a bored casing, a lock cylinder rotatable therein between predetermined normal limits of rotation upon the insertion of a proper key into the keyway of the cylinder, the cylinder having an open recess in its front face, means for positively preventing withdrawal of the cylinder from the casing bore except in a predetermined position of rotation which lies beyond one of its normal limits of rotation, a releasable stop member slidable in the open recess in the front face of the cylinder with a part projecting rearwardly for engagement with the casing when in its normal operative position to dene said limit of rotation, a. spring yieldingly urging the locking member to said operative position, and a finishing cap engaged over the front wall of the cylinder and holding said locking member and its spring in place.

3. In a lock, a bored casing, a lock cylinder rotatable therein between predetermined normal limits of rotation upon the insertion of a proper key into the keyway of the cylinder, means for positively preventing withdrawal of the cylinder from the casing bore except in a predetermined position of rotation which lies beyond one of its normal limits of rotation, a releasable stop member slidably mounted in the cylinder for movement in a plane substantially parallel to,

cooperable with the releasable stop member for y dening the predetermined position of rotation at which the cylinder may be withdrawn so as to facilitate insertion of the cylinder.

4. In a lock, a bored casing, a lock cylinder rotatable therein between predetermined normal` limits of rotation upon the insertion of a proper key into the keyway of the cylinder, means for positively preventing withdrawal of the cylinder from the casing bore except in a predetermined position of rotation which lies beyond one of its ,-7,5

normal limits of rotation, a releasable stop member slida'bly mounted in the cylinder for movement in a plane substantially parallel to one side or' the keyWay and having a part projecting-from the cylindrical surface of the cylinder for engagement with the casing to denne said limit of rotation, spring means yieldingly urging the stop member to its operative position, means on said stop member engageable by a tool inserted into the mouth of the keyway alongside of the key for retracting the stop member to inoperative position, means on the casing cooperable with the releasable stop member for dening the predetermined position of rotation at which the cylinder may be Withdrawn so as to facilitate insertion of the cylinder, said last named means on the casing having an inclined Wall to automatically retract the releasable stop member upon insertion of the cylinder into the casing bore.

5. In a lock, a bored casing, a lock cylinder rotatable therein between predetermined limits of rotation, a head on the cylinder having an open recess therein, and the cylinder having a keyway the mouth of which is located in said head, means for dening the normal limits of rotation of the cylinder including a releasable stop member slidable in the open recess in the cylinder head, a spring disposed in the same open recess in the cylinder head for yieldingly urging the stop member to its operative position, and a iinishing plate secured over the cylinder head and holding said stop member and its spring properly assembled in said recess.

6. In a lock, a bored casing, a lock cylinder rotatable therein, a head on the cylinder having an open recess in its front face, means for defining the normal limits of rotation of the cylinder including a releasable stop member in the form of a substantially L-shaped bar having a stern slidable in the open recess in the face of the cylinder head, and a head projecting from said stem to the rear of the cylinder head for operative engagement with the casing, a spring also confined in the open recess in the cylinder head to yieldingly urge the releasable stop member to its operative position, and a finishing plate engaging over the front face of the cylinder head and closing said recess to hold the stop member and its spring properly disposed therein.

7. In a lock, a bored casing, a lock cylinder rotatable therein, a head on the cylinder having an open recess in its front face, means for defining the normal limits of rotation of the cylinder including a releasable stop member in the form of a substantially L-shaped bar having a stem slidable in the open recess in they face of the cylinder head, and a head projecting from said stem to the rear of the cylinder head for operative engagement With the casing, a spring also conned in the open recess in the cylinder head to yieldingly urge the releasable stop member to its operative position, a finishing plate engaging over the iront face of the cylinder head and closing said recess to hold the stop member and its spring properly disposed therein, and means on said stop member engageable by a tool inserted through a hole in the finishing plate for retracting the stop member against the action of its spring.

8. In a lock, a bored casing, a key controlled lock cylinder rotatable therein upon insertion of a proper key, means for securing the lock cylinder against withdrawal from the casing, including a movable stop member mounted in the front part of the lock cylinder and adapted to be moved from operative to inoperative position by a tool used concurrently With the key, and a plate secured over the front of the lock cylinder to cover said stop member and retain the same in place, said plate having a hole partly exposing the stop member for operation by a tool inserted through said hole.

EDWARD N. JACOBI. 

